The Ultimate Sudoku Book for Smart Kids Ages 8–12: 400+ Fun Puzzles with Solutions – Learn Sudoku Step by Step with 4x4, 6x6, and 9x9 Grids That Get Harder as You Go!
Sudoku for Cars & Things that Go: 240 Sudoku Picture Puzzles for Kids Ages 4-8 | Easy, Medium, and Hard 4 x 4 Puzzles with Pictures of a Car, Train, ... Instructions on How to Play and Solutions